2 files changed, 13 insertions, 1 deletions
diff --git a/packages/frontend/src/lib/cache-warming.svelte.ts b/packages/frontend/src/lib/cache-warming.svelte.ts
index cda3fd1..0253c08 100644
--- a/packages/frontend/src/lib/cache-warming.svelte.ts
+++ b/packages/frontend/src/lib/cache-warming.svelte.ts
@@ -41,6 +41,12 @@ export interface WarmRequestParams {
 	keyId: string | null;
 	modelId: string | null;
 	agentModels: AgentModelEntry[] | null;
+	/**
+	 * The SAME reasoning effort the next real turn would use. It drives the
+	 * Anthropic thinking providerOptions, which is a message-cache key — warming
+	 * must match it so it refreshes the bucket the real message reads.
+	 */
+	reasoningEffort: string | null;
 }
 
 /** Reactive, per-tab warming UI state (read by the Chat Settings debug strip). */
@@ -177,6 +183,7 @@ export function createCacheWarmingStore() {
 					...(params?.keyId ? { keyId: params.keyId } : {}),
 					...(params?.modelId ? { modelId: params.modelId } : {}),
 					...(params?.agentModels ? { agentModels: params.agentModels } : {}),
+					...(params?.reasoningEffort ? { reasoningEffort: params.reasoningEffort } : {}),
 				}),
 			});
 			// A newer cancel/fire superseded this request — drop its result so it
diff --git a/packages/frontend/src/lib/tabs.svelte.ts b/packages/frontend/src/lib/tabs.svelte.ts
index a0125ef..ca04e62 100644
--- a/packages/frontend/src/lib/tabs.svelte.ts
+++ b/packages/frontend/src/lib/tabs.svelte.ts
@@ -251,7 +251,12 @@ export function createTabStore() {
 	cacheWarming.setRequestResolver((tabId) => {
 		const t = getTabById(tabId);
 		if (!t) return null;
-		return { keyId: t.keyId, modelId: t.modelId, agentModels: t.agentModels };
+		return {
+			keyId: t.keyId,
+			modelId: t.modelId,
+			agentModels: t.agentModels,
+			reasoningEffort: t.reasoningEffort,
+		};
 	});
 
 	$effect.root(() => {